import deepClone from './deepClone'

// JS对象深度合并
function deepMerge(target = {}, source = {}) {
  target = deepClone(target)
  if (typeof target !== 'object' || typeof source !== 'object') return false
  for (const prop in source) {
    if (!source.hasOwnProperty(prop)) continue
    if (prop in target) {
      if (typeof target[ prop ] !== 'object') {
        target[ prop ] = source[ prop ]
      } else {
        if (typeof source[ prop ] !== 'object') {
          target[ prop ] = source[ prop ]
        } else {
          if (target[ prop ].concat && source[ prop ].concat) {
            target[ prop ] = target[ prop ].concat(source[ prop ])
          } else {
            target[ prop ] = deepMerge(target[ prop ], source[ prop ])
          }
        }
      }
    } else {
      target[ prop ] = source[ prop ]
    }
  }
  return target
}

export default deepMerge
